Punch alarm system for photoprinting machines

Details Punch alarm system for photoprinting machines Punch alarm system for photoprinting machines

1977-08-12

1979-02-20

Hix, L. T.

Photocopying

Projection printing and copying cameras

With film severing

83 61, G03B 2900

Patent

active

041403908

ABSTRACT:
Sensors are added to a conventional photoprinting machine, adjacent the edges of the photographic print paper and downstream of the marking system in the machine, for monitoring the presence and absence of cut marks and sort marks in or on the strip of photographic print paper. The sensors are coupled to a logical circuit and associated control circuits which provide the operator of the photoprinting machine with an indication of the operability of the marking system in said machine.

REFERENCES:
patent: 3807855 (1974-04-01), Zajac
patent: 3948125 (1976-04-01), Hujer et al.

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